All 3 Uses

capitalism
in
Main Street, by Sinclair Lewis
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But Cy was a capitalist in charivaris.†
Chpt 9 *

capitalist = one who believes in an economic system based on voluntary exchange in a competitive environment with private ownership of property and businesses
that the capitalistic system of distribution and the Baptist wedding-ceremony were not known in the Garden of Eden;†
Chpt 20

capitalistic = related to an economic system based on voluntary exchange in a competitive environment with private ownership of property and businesses
The churches have always done it, and the political orators—and I suppose I do it when I call Mrs. Bogart a 'Puritan' and Mr. Stowbody a 'capitalist.'†
Chpt 36

capitalist = one who believes in an economic system based on voluntary exchange in a competitive environment with private ownership of property and businesses

Definitions:

(1) (capitalism)
an economic system based on voluntary exchange in a competitive environment with private ownership of property and businesses

Proponents of capitalism argue that voluntary exchanges tap into people’s local knowledge and natural self-interest, channeling millions of everyday decisions into broader benefits for society. At the same time, most of them also support a role for government in addressing problems that “pure” capitalism handles poorly—such as monopolies, shared costs and benefits like pollution and national defense, and providing a safety net for those who are hit by bad luck.
(2) (meaning too rare to warrant focus)